Advertisement
8 ZERO POINT RETURN CONTROL
Machine zero point return start
(Positioning start signal)
Zero point return request flag
[RX(n+1)F, RX(n+4)F]
Zero point return complete flag
[RX(n+2)0, RX(n+5)0]
Deviation counter clear output
Axis operation status
[RWrn+7, RWrn+15]
Md.44 Movement amount
after near-point dog ON
Current feed value
[RWrn+0 to 1, RWrn+8 to 9]
Md.30 Machine feed value
Fig. 8.4 Operation when the dwell time elapses during deceleration from the zero point return
speed
Restrictions
(1) Make sure to limit the torque for the servomotor after starting the deceleration
to " Pr.49 Creep speed". If the torque is not limited, the servomotor may fail
when the machine presses against the stopper. (Refer to section "12.4.2
Torque limit function".)
(2) The zero point return retry function cannot be used with the "stopper stop
method 1)."
Precautions during operation
(1) Set a value in the " Pr.51 Zero point return dwell time" that is equal to or
higher than the movement time from the near-point dog ON to the time the
machine presses against the stopper.
(2) If the " Pr.51 Zero point return dwell time" elapses during deceleration from
the " Pr.48 Zero point return speed," deceleration and stop are caused.
V
OFF
OFF
OFF
Standing by
Inconsistent
Inconsistent
Zero point return speed
Pr.48
Valid torque limit range
Torque limit
ON
Near-point dog
OFF
Dwell time measurement
ON
ON
In zero point return
0
Value the machine moved is stored
8 - 9
MELSEC-A
Stopper
Time out of
dwell time
ON
Standing by
Zero point address
t
Advertisement
Chapters
Troubleshooting
